Chris wrote:

Now that I have a decent start on getting my house fixed, I would like
to ask advice about what to do about my garden and lawn. My main
concern is soil remediation- my property is all sand and given the
proximity to the ocean, it's usually salty but it's got to be severe
now. We've got good drainage and we've had snow and rain since then-
will that have gotten rid of the salt and any contaminants?

But of course, salt is highly water soluable... precipitation
constantly desalinates seashores. A couple of heavy downpours will
bring your soil back to its previous/normal salinity